Haven't had an M3 or RS4, but have had C63 and you couldn't give me another one as a gift (well maybe you could and then I'd sell it). Yes goes good, sounds good, but MB servicing costs are outragous and the number of warranty claims is staggering. Definietly not a car to own outside the warranty period. Buying the car is the cheap bit, keeping "consumable" parts up to it is the hard part. If going again I'd get the M3.
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